音響人工結晶の透過特性および導波特性のFDTD法による評価
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概要
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音響人工結晶とは、光やマイクロ波・ミリ波におけるフォトニック結晶と同様に、一様なホスト媒質中に波長オーダーの間隔で音響散乱体が周期的に配置された構造を持ち、特定の波長帯において伝搬方向にかかわらず大きな減衰定数を示し、洩れの少ない波長オーダの導波路の構成が期待されるものである。我々は、音響フィルタや音響導波路として応用する可能性を求めて、研究を始めている。その解析手段として、波動場の可視化も備えたFDTD法による波動伝搬計算を確立し、ホスト媒質と散乱体のパラメータの種々の組合せにおける音響透過率の波長特性を論じ、さらに、いわゆるfull band gapを持たない周期構造による幾つかの導波路を定量的に解析した。
- 社団法人電子情報通信学会の論文
- 2000-09-11
著者
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